Vacuum cup for article lifting machine



FIG. 1 is a perspective view of a vacuum cup for article lifting machine showing my new design;

FIG. 2 is an enlarged side elevational view thereof;

FIG. 3 is a top plan view thereof as seen from the top of FIG. 2; and

FIG. 4 is a bottom plan view thereof as seen from the bottom of FIG. 2. 

The ornamental design for a vacuum cup for article lifting machine, as shown. 